package servlets;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Date;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

public class PrimerServlet extends HttpServlet {

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet PrimerServlet</title>");  
            out.println("</head>");
            out.println("<body>");
            out.println(new Date());
            out.println("<h1>Servlet PrimerServlet at " + request.getContextPath () + "</h1>");
            ServletContext application = super.getServletContext();
            DataSource ds = (DataSource) application.getAttribute("datasource");            
            out.println("Hay datasource: "+(ds!=null));
            
            try {
                Connection con = ds.getConnection();
                ResultSet rs = con.createStatement().executeQuery("select * from Persona");
                while (rs.next()) {
                    out.print(rs.getString("nombre") + "<br/>");
                }
                con.close();
            } catch (SQLException sQLException) {
                application.log("Error acceso datos: ",sQLException);
            }
 
            out.println("</body>");
            out.println("</html>");
            
        } finally {            
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
